PRECIPITATION - atmos.umd.educlimate/Summaries/mdjul18.pdf · PRECIPITATION Based on the National...
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July 2018 Volume: 01, No: 7 PRECIPITATION Based on the National Centers for Environmental Information (NCEI), the statewide total July precipitation was 8.73 inches, which was 3.76 inches more than last month, 0.97 inches more than in July 2017, and 4.58 inch more than the 1981-2010 average, making it the 2nd wettest July in the 124-year period of record. It was the wettest July since 1945 (Table 1). Above-average precipitation was observed in all parts of the state (Figure 1). The greatest monthly precipitation accumulation was 16.73 inches, recorded at Baltimore-Washington International Airport. The greatest 24-hour precipitation was 7.32 inches, recorded at BIRDSVILLE 0.2, WSW in Anne Arundel County on July 22. Based on historical records, statewide July precipitation showed no long-term trend since 1895. The highest and lowest July precipitation for the state ranged from 10.70 inches in 1945 to 1.34 inch in 1983 (Figure 2). Figure 1: July 2018 precipitation percent of normal for Maryland. (NRCC) Compiled by Phillip Stratton Assistant to the State Climatologist Office of the Maryland State Climatologist Department of Atmospheric and Oceanic Science 4254 Stadium Dr, College Park, MD 20742 www.atmos.umd.edu/~climate [email protected] (301) 405-7223
Transcript of PRECIPITATION - atmos.umd.educlimate/Summaries/mdjul18.pdf · PRECIPITATION Based on the National...
July 2018 Volume: 01, No: 7
PRECIPITATIONBased on the National Centers for Environmental Information (NCEI), the statewide total July precipitation was 8.73 inches, which was 3.76 inches more than last month, 0.97 inches more than in July 2017, and 4.58 inch more than the 1981-2010 average, making it the 2nd wettest July in the 124-year period of record. It was the wettest July since 1945 (Table 1). Above-average precipitation was observed in all parts of the state (Figure 1). The greatest monthly precipitation accumulation was 16.73 inches, recorded at Baltimore-Washington International Airport. The greatest 24-hour precipitation was 7.32 inches, recorded at BIRDSVILLE 0.2, WSW in Anne Arundel County on July 22. Based on historical records, statewide July precipitation showed no long-term trendsince 1895. The highest and lowest July precipitation for the state ranged from 10.70 inches in 1945 to 1.34 inch in 1983 (Figure 2).
Figure 1: July 2018 precipitation percent of normal for Maryland. (NRCC)
Compiled by Phillip Stratton Assistant to the State Climatologist
Office of the Maryland State Climatologist
Department of Atmospheric and Oceanic Science
4254 Stadium Dr, College Park, MD 20742
www.atmos.umd.edu/~climate
(301) 405-7223
July 2018 Volume: 01, No: 7
Figure 2: Historical July precipitation time series for Maryland.
July Precipitation Statistics (124 Years)
Record High: 10.70” in 1945 July 2018 value: 8.73”
Record Low: 1.34” in 1983 1981-2010 average: 4.18”
Trend: 0.00” per decade Anomaly: 4.55”
Rank:123rd driest Driest since: 2017
2nd wettest Wettest Since: 1945
Table 1: Maryland July Precipitation Statistics
July 2018 Volume: 01, No: 7
TEMPERATURE
Figure 3: July 2018 average temperature departure from normal for Maryland. (NRCC)
The official state average July temperature was 76.4 F, 4.2 °F warmer than last month and 0.9 °F coolerthan in July 2017, but 1.3 °F warmer than the 1981-2010 average, making it the 93rd coolest July in the124-year period of record. It was the warmest July since 2017 (Table 2). Average temperatureswere observed commonly in the state, except for a few small areas where slightly above and below-average conditions were observed (Figure 3). The state’s highest and lowest daily temperatures ranged from 100 °F on July 3rd at the Maryland Science Center, to 43 °F on July 30th at the Savage River Dam. Based on the historical records, the state average July temperature showed a positive long-term trend of0.1 °F per decade since 1895. The highest and lowest monthly state July average temperatures ranged from 79.8 °F in 2012 to 71.4 °F in 1895 (Figure 4).
July 2018 Volume: 01, No: 7
Figure 4: Historical July temperature time series for Maryland.
July Temperature Statistics (124 Years)
Record High: 79.8 °F in 2012 July 2018 value: 76.4 °F
Record Low: 71.4 °F in 1895 1981-2010 average: 76.1 °F
Trend: 0.1 °F per decade Anomaly: 0.3 °F
Rank:32nd warmest Warmest since: 2017
93nd coolest Coolest Since: 2015
Table 2: Maryland July Temperature Statistics
July 2018 Volume: 01, No: 7
Figure 5: Drought Monitor map comparison for Maryland at the beginning (left) and end (right) of July 2018.
Drought Monitor (DM): In general Maryland experienced little to no drought except for a brief
period the week of July 17th. Figure 5 shows a comparison of the drought conditions across the state from the beginning to the end of the month. Figure 6 below shows the statewide drought coverage in percentage and intensity in a time scale representing the state from the beginning to the end of the month, with a one-week resolution.
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Maryland State Drought Severity and Coverage (July 2018)
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Figure 6: Maryland drought severity and coverage for July 2018.
July 2018 Volume: 01, No: 7
Storm Reports: The NOAA Storm Prediction Center’s Storm Report reported a total of 40 significant storm events in July. Table 3 summarizes the number of tornado (0), hail (1) and damaging wind (39) reports in July, while Figure 7 geographically displays the locations of these storm reports.
Figure 7: Map of July 2018 Maryland storm events (red: tornado, blue:wind, green:hail).
Category Number of Reports
Tornado reports 0
Hail reports 1
Wind reports 39
Total 40
Table 3: Summary of July severe storm reports in Maryland. (SPC, NOAA)
